I learned about this over the weekend. A neighbor claims this is an easy way to catch nightcrawlers. Get a stake about three ft long. Drive it into the ground about one ft. Cutting the end to a point makes this job quick. My neighbor uses a 2x2 stake. Get a metal bar, and rub it along the wooden stake. It works best at night. The sound produced replicates the sound of a hungry mole. If you've ever seen any trace of moles in your yard, it will work. The worms come to the surface to escape the hungry mole. Bring a flashlight to pick them up, and try some different spots in your yard. I can't verify this myself, but my neighbor hasn't bought nightcrawlers in years, and, he showed me a bunch he had in an old refrigerator he keeps in his garage. Crawlers are all he fishes with. I plan on trying this one of these nights. Has anyone else ever done any " worm grunting?"